●1. Stage adjustable knee height for students and family lengths ●2.Easy to assemble with few pieces and easy to understand shapes that can be easily assembled by people who are not used to build furniture. Ready to assemble ●3.Strong frame is exquisite and stable. No center post design allows you to sit on a skirt easily ●4.Multifunction: sitting correction, spine correction, lower back fatigue, shaping beautiful buttocks, correcting children sitting, preventing back and myopia ●5. Quality service, please contact me if you have any problems. ★★★ Please check the specialty stores products (marriage department store)